Chemistry
Assertion (A): At zero Kelvin (-273°C), the volume occupied by a gas is considered as zero.
Reason (R): Theoretically, molecular motion completely ceases at zero Kelvin.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Gas Laws
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation— According to Charles’s Law, gas volume decreases linearly with temperature (in Kelvin). So, theoretically at 0 K, the volume of an ideal gas would be zero. Hence, the assertion (A) is true. As temperature increases, molecular motion increases, and when temperature decreases, molecular motion also decreases. Theoretically, this suggests that when the temperature is zero, molecular motion ceases. Hence, the reason (R) is true and it is the correct explanation of assertion (A).
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